摘要
我国北方农牧交错带是环境变化的敏感地区之一.全新世以来,根据本区的沙地形成、演化和湖泊演化对比,得知近1万a来有过四五次较大的气候波动;自3000a以来干湿频率有加强的趋势。本地带具有准2000a周期及准22、准38、准83、准102和准400a周期,为预测未来环境变化提供依据,为制定开发规划时参考。
the agro-animal husbandry transitional zone in North China is one of the regions sensitive to environmental variations. Based on the formetion and evolution of deserts in this region and erolution comparison of lake basins since Holocene, it is conduded that there have been 4,5 obvious climatic fluctuations in recent ten thousand years, and that the frequency of arid-humid changes has trended to enhance since 3000year B. P. There exists a quasi-2000year cycle with quasi-22year, quasi-36year, quasi-83 year, quasi-102 year and quasi-400year cycles in this region, thus providing both sciertific bases for forecasting coming onvironmental vicissi-tudes and reference data for formulating developmental programs.
出处
《北京师范大学学报（自然科学版）》
CAS
CSCD
1991年第1期103-110,共8页
Journal of Beijing Normal University(Natural Science)
基金
国家自然科学基金
关键词
农牧交错带
全新世
环境演变
agro-animal husbandry transitional zone
Holocene
environmental vicissitudes
tendeney forecast for environmental vicissitudes.
